1 files changed, 133 insertions, 0 deletions
diff --git a/lib/xmalloc.c b/lib/xmalloc.c
new file mode 100644
index 0000000..69c4e7d
--- /dev/null
+++ b/lib/xmalloc.c
@@ -0,0 +1,133 @@
+/* xmalloc.c -- malloc with out of memory checking
+
+   Copyright (C) 1990-2000, 2002-2006, 2008-2020 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#define XALLOC_INLINE _GL_EXTERN_INLINE
+
+#include "xalloc.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+/* 1 if calloc, malloc and realloc are known to be compatible with GNU.
+   This matters if we are not also using the calloc-gnu, malloc-gnu
+   and realloc-gnu modules, which define HAVE_CALLOC_GNU,
+   HAVE_MALLOC_GNU and HAVE_REALLOC_GNU and support the GNU API even
+   on non-GNU platforms.  */
+#if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
+enum { HAVE_GNU_CALLOC = 1 };
+#else
+enum { HAVE_GNU_CALLOC = 0 };
+#endif
+#if defined HAVE_MALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
+enum { HAVE_GNU_MALLOC = 1 };
+#else
+enum { HAVE_GNU_MALLOC = 0 };
+#endif
+#if defined HAVE_REALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
+enum { HAVE_GNU_REALLOC = 1 };
+#else
+enum { HAVE_GNU_REALLOC = 0 };
+#endif
+
+/* Allocate N bytes of memory dynamically, with error checking.  */
+
+void *
+xmalloc (size_t n)
+{
+  void *p = malloc (n);
+  if (!p && (HAVE_GNU_MALLOC || n))
+    xalloc_die ();
+  return p;
+}
+
+/* Change the size of an allocated block of memory P to N bytes,
+   with error checking.  */
+
+void *
+xrealloc (void *p, size_t n)
+{
+  if (!HAVE_GNU_REALLOC && !n && p)
+    {
+      /* The GNU and C99 realloc behaviors disagree here.  Act like GNU.  */
+      free (p);
+      return NULL;
+    }
+
+  void *r = realloc (p, n);
+  if (!r && (n || (HAVE_GNU_REALLOC && !p)))
+    xalloc_die ();
+  return r;
+}
+
+/* If P is null, allocate a block of at least *PN bytes; otherwise,
+   reallocate P so that it contains more than *PN bytes.  *PN must be
+   nonzero unless P is null.  Set *PN to the new block's size, and
+   return the pointer to the new block.  *PN is never set to zero, and
+   the returned pointer is never null.  */
+
+void *
+x2realloc (void *p, size_t *pn)
+{
+  return x2nrealloc (p, pn, 1);
+}
+
+/* Allocate N bytes of zeroed memory dynamically, with error checking.
+   There's no need for xnzalloc (N, S), since it would be equivalent
+   to xcalloc (N, S).  */
+
+void *
+xzalloc (size_t n)
+{
+  return xcalloc (n, 1);
+}
+
+/* Allocate zeroed memory for N elements of S bytes, with error
+   checking.  S must be nonzero.  */
+
+void *
+xcalloc (size_t n, size_t s)
+{
+  void *p;
+  /* Test for overflow, since objects with size greater than
+     PTRDIFF_MAX cause pointer subtraction to go awry.  Omit size-zero
+     tests if HAVE_GNU_CALLOC, since GNU calloc never returns NULL if
+     successful.  */
+  if (xalloc_oversized (n, s)
+      || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
+    xalloc_die ();
+  return p;
+}
+
+/* Clone an object P of size S, with error checking.  There's no need
+   for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
+   need for an arithmetic overflow check.  */
+
+void *
+xmemdup (void const *p, size_t s)
+{
+  return memcpy (xmalloc (s), p, s);
+}
+
+/* Clone STRING.  */
+
+char *
+xstrdup (char const *string)
+{
+  return xmemdup (string, strlen (string) + 1);
+}